Polish parliamentary speaker Bronisław Komorowski legally becomes Acting President of Poland.
The Polish presidential election is being held earlier, following the death of Polish President Lech Kaczyński in a plane crash on 10 April 2010 near Smolensk. The two front-runners are Bronisław Komorowski from the ruling center-right Civic Platform (Platforma Obywatelska) party and Jarosław Kaczyński from the right-wing Law and Justice (Prawo i Sprawiedliwość) party.
Polish officials say 6,000 Polish zloty were withdrawn using credit cards stolen from a passenger killed in the 2010 Polish Air Force Tu-154 crash near Smolensk. Poland says four soldiers have been arrested, while Russia denies this.
The body of Poland's First Lady, Maria Kaczyńska, is flown to Warsaw to lie in state alongside that of her husband, President Lech Kaczyński. Poland has seen an outpouring of grief since the couple and scores of other senior Polish officials died in a plane crash in western Russia on Saturday.
A Tu-154 from the 36th Special Aviation Regiment crashes while landing at military airport Severny in Smolensk Oblast, Russia; 96 persons onboard are reported dead. Pilot error is seen as a possible cause of the crash.